<template>
    <div>数字:{{ num }}</div>
    <button @click="add">+1</button>
     <button @click="dec">-1</button>
</template>

<script>
export default{
    data() {
        return{
            num: 1,
        }
    },
    methods: {
        add() {
            this.num++;
        },
        dec() {
            this.num--;
        },
    },
};
</script>

<style>
</style>